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gfxFont.cpp
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gfxFont.cpp
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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "gfxFont.h"
#include "mozilla/BinarySearch.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/FontPropertyTypes.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/MathAlgorithms.h"
#include "mozilla/StaticPrefs.h"
#include "mozilla/SVGContextPaint.h"
#include "mozilla/Logging.h"
#include "nsITimer.h"
#include "gfxGlyphExtents.h"
#include "gfxPlatform.h"
#include "gfxTextRun.h"
#include "nsGkAtoms.h"
#include "gfxTypes.h"
#include "gfxContext.h"
#include "gfxFontMissingGlyphs.h"
#include "gfxGraphiteShaper.h"
#include "gfxHarfBuzzShaper.h"
#include "gfxUserFontSet.h"
#include "nsSpecialCasingData.h"
#include "nsTextRunTransformations.h"
#include "nsUGenCategory.h"
#include "nsUnicodeProperties.h"
#include "nsStyleConsts.h"
#include "mozilla/AppUnits.h"
#include "mozilla/Likely.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Preferences.h"
#include "mozilla/Services.h"
#include "mozilla/Telemetry.h"
#include "gfxMathTable.h"
#include "gfxSVGGlyphs.h"
#include "gfx2DGlue.h"
#include "TextDrawTarget.h"
#include "GreekCasing.h"
#include "cairo.h"
#ifdef XP_WIN
# include "cairo-win32.h"
# include "gfxWindowsPlatform.h"
#endif
#include "harfbuzz/hb.h"
#include "harfbuzz/hb-ot.h"
#include <algorithm>
#include <limits>
#include <cmath>
using namespace mozilla;
using namespace mozilla::gfx;
using namespace mozilla::unicode;
using mozilla::services::GetObserverService;
gfxFontCache* gfxFontCache::gGlobalCache = nullptr;
#ifdef DEBUG_roc
# define DEBUG_TEXT_RUN_STORAGE_METRICS
#endif
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
uint32_t gTextRunStorageHighWaterMark = 0;
uint32_t gTextRunStorage = 0;
uint32_t gFontCount = 0;
uint32_t gGlyphExtentsCount = 0;
uint32_t gGlyphExtentsWidthsTotalSize = 0;
uint32_t gGlyphExtentsSetupEagerSimple = 0;
uint32_t gGlyphExtentsSetupEagerTight = 0;
uint32_t gGlyphExtentsSetupLazyTight = 0;
uint32_t gGlyphExtentsSetupFallBackToTight = 0;
#endif
#define LOG_FONTINIT(args) \
MOZ_LOG(gfxPlatform::GetLog(eGfxLog_fontinit), LogLevel::Debug, args)
#define LOG_FONTINIT_ENABLED() \
MOZ_LOG_TEST(gfxPlatform::GetLog(eGfxLog_fontinit), LogLevel::Debug)
/*
* gfxFontCache - global cache of gfxFont instances.
* Expires unused fonts after a short interval;
* notifies fonts to age their cached shaped-word records;
* observes memory-pressure notification and tells fonts to clear their
* shaped-word caches to free up memory.
*/
MOZ_DEFINE_MALLOC_SIZE_OF(FontCacheMallocSizeOf)
NS_IMPL_ISUPPORTS(gfxFontCache::MemoryReporter, nsIMemoryReporter)
/*virtual*/
gfxTextRunFactory::~gfxTextRunFactory() {
// Should not be dropped by stylo
MOZ_ASSERT(NS_IsMainThread());
}
NS_IMETHODIMP
gfxFontCache::MemoryReporter::CollectReports(
nsIHandleReportCallback* aHandleReport, nsISupports* aData,
bool aAnonymize) {
FontCacheSizes sizes;
gfxFontCache::GetCache()->AddSizeOfIncludingThis(&FontCacheMallocSizeOf,
&sizes);
MOZ_COLLECT_REPORT("explicit/gfx/font-cache", KIND_HEAP, UNITS_BYTES,
sizes.mFontInstances,
"Memory used for active font instances.");
MOZ_COLLECT_REPORT("explicit/gfx/font-shaped-words", KIND_HEAP, UNITS_BYTES,
sizes.mShapedWords,
"Memory used to cache shaped glyph data.");
return NS_OK;
}
NS_IMPL_ISUPPORTS(gfxFontCache::Observer, nsIObserver)
NS_IMETHODIMP
gfxFontCache::Observer::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* someData) {
if (!nsCRT::strcmp(aTopic, "memory-pressure")) {
gfxFontCache* fontCache = gfxFontCache::GetCache();
if (fontCache) {
fontCache->FlushShapedWordCaches();
}
} else {
MOZ_ASSERT_UNREACHABLE("unexpected notification topic");
}
return NS_OK;
}
nsresult gfxFontCache::Init() {
NS_ASSERTION(!gGlobalCache, "Where did this come from?");
gGlobalCache =
new gfxFontCache(SystemGroup::EventTargetFor(TaskCategory::Other));
if (!gGlobalCache) {
return NS_ERROR_OUT_OF_MEMORY;
}
RegisterStrongMemoryReporter(new MemoryReporter());
return NS_OK;
}
void gfxFontCache::Shutdown() {
delete gGlobalCache;
gGlobalCache = nullptr;
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
printf("Textrun storage high water mark=%d\n", gTextRunStorageHighWaterMark);
printf("Total number of fonts=%d\n", gFontCount);
printf("Total glyph extents allocated=%d (size %d)\n", gGlyphExtentsCount,
int(gGlyphExtentsCount * sizeof(gfxGlyphExtents)));
printf("Total glyph extents width-storage size allocated=%d\n",
gGlyphExtentsWidthsTotalSize);
printf("Number of simple glyph extents eagerly requested=%d\n",
gGlyphExtentsSetupEagerSimple);
printf("Number of tight glyph extents eagerly requested=%d\n",
gGlyphExtentsSetupEagerTight);
printf("Number of tight glyph extents lazily requested=%d\n",
gGlyphExtentsSetupLazyTight);
printf("Number of simple glyph extent setups that fell back to tight=%d\n",
gGlyphExtentsSetupFallBackToTight);
#endif
}
gfxFontCache::gfxFontCache(nsIEventTarget* aEventTarget)
: gfxFontCacheExpirationTracker(aEventTarget) {
nsCOMPtr<nsIObserverService> obs = GetObserverService();
if (obs) {
obs->AddObserver(new Observer, "memory-pressure", false);
}
#ifndef RELEASE_OR_BETA
// Currently disabled for release builds, due to unexplained crashes
// during expiration; see bug 717175 & 894798.
nsIEventTarget* target = nullptr;
if (XRE_IsContentProcess() && NS_IsMainThread()) {
target = aEventTarget;
}
NS_NewTimerWithFuncCallback(getter_AddRefs(mWordCacheExpirationTimer),
WordCacheExpirationTimerCallback, this,
SHAPED_WORD_TIMEOUT_SECONDS * 1000,
nsITimer::TYPE_REPEATING_SLACK,
"gfxFontCache::gfxFontCache", target);
#endif
}
gfxFontCache::~gfxFontCache() {
// Ensure the user font cache releases its references to font entries,
// so they aren't kept alive after the font instances and font-list
// have been shut down.
gfxUserFontSet::UserFontCache::Shutdown();
if (mWordCacheExpirationTimer) {
mWordCacheExpirationTimer->Cancel();
mWordCacheExpirationTimer = nullptr;
}
// Expire everything that has a zero refcount, so we don't leak them.
AgeAllGenerations();
// All fonts should be gone.
NS_WARNING_ASSERTION(mFonts.Count() == 0,
"Fonts still alive while shutting down gfxFontCache");
// Note that we have to delete everything through the expiration
// tracker, since there might be fonts not in the hashtable but in
// the tracker.
}
bool gfxFontCache::HashEntry::KeyEquals(const KeyTypePointer aKey) const {
const gfxCharacterMap* fontUnicodeRangeMap = mFont->GetUnicodeRangeMap();
return aKey->mFontEntry == mFont->GetFontEntry() &&
aKey->mStyle->Equals(*mFont->GetStyle()) &&
((!aKey->mUnicodeRangeMap && !fontUnicodeRangeMap) ||
(aKey->mUnicodeRangeMap && fontUnicodeRangeMap &&
aKey->mUnicodeRangeMap->Equals(fontUnicodeRangeMap)));
}
gfxFont* gfxFontCache::Lookup(const gfxFontEntry* aFontEntry,
const gfxFontStyle* aStyle,
const gfxCharacterMap* aUnicodeRangeMap) {
Key key(aFontEntry, aStyle, aUnicodeRangeMap);
HashEntry* entry = mFonts.GetEntry(key);
Telemetry::Accumulate(Telemetry::FONT_CACHE_HIT, entry != nullptr);
if (!entry) return nullptr;
return entry->mFont;
}
void gfxFontCache::AddNew(gfxFont* aFont) {
Key key(aFont->GetFontEntry(), aFont->GetStyle(),
aFont->GetUnicodeRangeMap());
HashEntry* entry = mFonts.PutEntry(key);
if (!entry) return;
gfxFont* oldFont = entry->mFont;
entry->mFont = aFont;
// Assert that we can find the entry we just put in (this fails if the key
// has a NaN float value in it, e.g. 'sizeAdjust').
MOZ_ASSERT(entry == mFonts.GetEntry(key));
// If someone's asked us to replace an existing font entry, then that's a
// bit weird, but let it happen, and expire the old font if it's not used.
if (oldFont && oldFont->GetExpirationState()->IsTracked()) {
// if oldFont == aFont, recount should be > 0,
// so we shouldn't be here.
NS_ASSERTION(aFont != oldFont, "new font is tracked for expiry!");
NotifyExpired(oldFont);
}
}
void gfxFontCache::NotifyReleased(gfxFont* aFont) {
nsresult rv = AddObject(aFont);
if (NS_FAILED(rv)) {
// We couldn't track it for some reason. Kill it now.
DestroyFont(aFont);
}
// Note that we might have fonts that aren't in the hashtable, perhaps because
// of OOM adding to the hashtable or because someone did an AddNew where
// we already had a font. These fonts are added to the expiration tracker
// anyway, even though Lookup can't resurrect them. Eventually they will
// expire and be deleted.
}
void gfxFontCache::NotifyExpired(gfxFont* aFont) {
aFont->ClearCachedWords();
RemoveObject(aFont);
DestroyFont(aFont);
}
void gfxFontCache::DestroyFont(gfxFont* aFont) {
Key key(aFont->GetFontEntry(), aFont->GetStyle(),
aFont->GetUnicodeRangeMap());
HashEntry* entry = mFonts.GetEntry(key);
if (entry && entry->mFont == aFont) {
mFonts.RemoveEntry(entry);
}
NS_ASSERTION(aFont->GetRefCount() == 0,
"Destroying with non-zero ref count!");
delete aFont;
}
/*static*/
void gfxFontCache::WordCacheExpirationTimerCallback(nsITimer* aTimer,
void* aCache) {
gfxFontCache* cache = static_cast<gfxFontCache*>(aCache);
for (auto it = cache->mFonts.Iter(); !it.Done(); it.Next()) {
it.Get()->mFont->AgeCachedWords();
}
}
void gfxFontCache::FlushShapedWordCaches() {
for (auto it = mFonts.Iter(); !it.Done(); it.Next()) {
it.Get()->mFont->ClearCachedWords();
}
}
void gfxFontCache::NotifyGlyphsChanged() {
for (auto it = mFonts.Iter(); !it.Done(); it.Next()) {
it.Get()->mFont->NotifyGlyphsChanged();
}
}
void gfxFontCache::AddSizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
FontCacheSizes* aSizes) const {
// TODO: add the overhead of the expiration tracker (generation arrays)
aSizes->mFontInstances += mFonts.ShallowSizeOfExcludingThis(aMallocSizeOf);
for (auto iter = mFonts.ConstIter(); !iter.Done(); iter.Next()) {
iter.Get()->mFont->AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
}
}
void gfxFontCache::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
FontCacheSizes* aSizes) const {
aSizes->mFontInstances += aMallocSizeOf(this);
AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
}
#define MAX_SSXX_VALUE 99
#define MAX_CVXX_VALUE 99
static void LookupAlternateValues(gfxFontFeatureValueSet* featureLookup,
const nsACString& aFamily,
const nsTArray<gfxAlternateValue>& altValue,
nsTArray<gfxFontFeature>& aFontFeatures) {
uint32_t numAlternates = altValue.Length();
for (uint32_t i = 0; i < numAlternates; i++) {
const gfxAlternateValue& av = altValue.ElementAt(i);
AutoTArray<uint32_t, 4> values;
// map <family, name, feature> ==> <values>
bool found = featureLookup->GetFontFeatureValuesFor(aFamily, av.alternate,
av.value, values);
uint32_t numValues = values.Length();
// nothing defined, skip
if (!found || numValues == 0) {
continue;
}
gfxFontFeature feature;
if (av.alternate == NS_FONT_VARIANT_ALTERNATES_CHARACTER_VARIANT) {
NS_ASSERTION(numValues <= 2,
"too many values allowed for character-variant");
// character-variant(12 3) ==> 'cv12' = 3
uint32_t nn = values.ElementAt(0);
// ignore values greater than 99
if (nn == 0 || nn > MAX_CVXX_VALUE) {
continue;
}
feature.mValue = 1;
if (numValues > 1) {
feature.mValue = values.ElementAt(1);
}
feature.mTag = HB_TAG('c', 'v', ('0' + nn / 10), ('0' + nn % 10));
aFontFeatures.AppendElement(feature);
} else if (av.alternate == NS_FONT_VARIANT_ALTERNATES_STYLESET) {
// styleset(1 2 7) ==> 'ss01' = 1, 'ss02' = 1, 'ss07' = 1
feature.mValue = 1;
for (uint32_t v = 0; v < numValues; v++) {
uint32_t nn = values.ElementAt(v);
if (nn == 0 || nn > MAX_SSXX_VALUE) {
continue;
}
feature.mTag = HB_TAG('s', 's', ('0' + nn / 10), ('0' + nn % 10));
aFontFeatures.AppendElement(feature);
}
} else {
NS_ASSERTION(numValues == 1,
"too many values for font-specific font-variant-alternates");
feature.mValue = values.ElementAt(0);
switch (av.alternate) {
case NS_FONT_VARIANT_ALTERNATES_STYLISTIC: // salt
feature.mTag = HB_TAG('s', 'a', 'l', 't');
break;
case NS_FONT_VARIANT_ALTERNATES_SWASH: // swsh, cswh
feature.mTag = HB_TAG('s', 'w', 's', 'h');
aFontFeatures.AppendElement(feature);
feature.mTag = HB_TAG('c', 's', 'w', 'h');
break;
case NS_FONT_VARIANT_ALTERNATES_ORNAMENTS: // ornm
feature.mTag = HB_TAG('o', 'r', 'n', 'm');
break;
case NS_FONT_VARIANT_ALTERNATES_ANNOTATION: // nalt
feature.mTag = HB_TAG('n', 'a', 'l', 't');
break;
default:
feature.mTag = 0;
break;
}
NS_ASSERTION(feature.mTag, "unsupported alternate type");
if (!feature.mTag) {
continue;
}
aFontFeatures.AppendElement(feature);
}
}
}
/* static */ void gfxFontShaper::MergeFontFeatures(
const gfxFontStyle* aStyle, const nsTArray<gfxFontFeature>& aFontFeatures,
bool aDisableLigatures, const nsACString& aFamilyName, bool aAddSmallCaps,
void (*aHandleFeature)(const uint32_t&, uint32_t&, void*),
void* aHandleFeatureData) {
uint32_t numAlts = aStyle->alternateValues.Length();
const nsTArray<gfxFontFeature>& styleRuleFeatures = aStyle->featureSettings;
// Bail immediately if nothing to do, which is the common case.
if (styleRuleFeatures.IsEmpty() && aFontFeatures.IsEmpty() &&
!aDisableLigatures &&
aStyle->variantCaps == NS_FONT_VARIANT_CAPS_NORMAL &&
aStyle->variantSubSuper == NS_FONT_VARIANT_POSITION_NORMAL &&
numAlts == 0) {
return;
}
nsDataHashtable<nsUint32HashKey, uint32_t> mergedFeatures;
// Ligature features are enabled by default in the generic shaper,
// so we explicitly turn them off if necessary (for letter-spacing)
if (aDisableLigatures) {
mergedFeatures.Put(HB_TAG('l', 'i', 'g', 'a'), 0);
mergedFeatures.Put(HB_TAG('c', 'l', 'i', 'g'), 0);
}
// add feature values from font
uint32_t i, count;
count = aFontFeatures.Length();
for (i = 0; i < count; i++) {
const gfxFontFeature& feature = aFontFeatures.ElementAt(i);
mergedFeatures.Put(feature.mTag, feature.mValue);
}
// font-variant-caps - handled here due to the need for fallback handling
// petite caps cases can fallback to appropriate smallcaps
uint32_t variantCaps = aStyle->variantCaps;
switch (variantCaps) {
case NS_FONT_VARIANT_CAPS_NORMAL:
break;
case NS_FONT_VARIANT_CAPS_ALLSMALL:
mergedFeatures.Put(HB_TAG('c', '2', 's', 'c'), 1);
// fall through to the small-caps case
MOZ_FALLTHROUGH;
case NS_FONT_VARIANT_CAPS_SMALLCAPS:
mergedFeatures.Put(HB_TAG('s', 'm', 'c', 'p'), 1);
break;
case NS_FONT_VARIANT_CAPS_ALLPETITE:
mergedFeatures.Put(aAddSmallCaps ? HB_TAG('c', '2', 's', 'c')
: HB_TAG('c', '2', 'p', 'c'),
1);
// fall through to the petite-caps case
MOZ_FALLTHROUGH;
case NS_FONT_VARIANT_CAPS_PETITECAPS:
mergedFeatures.Put(aAddSmallCaps ? HB_TAG('s', 'm', 'c', 'p')
: HB_TAG('p', 'c', 'a', 'p'),
1);
break;
case NS_FONT_VARIANT_CAPS_TITLING:
mergedFeatures.Put(HB_TAG('t', 'i', 't', 'l'), 1);
break;
case NS_FONT_VARIANT_CAPS_UNICASE:
mergedFeatures.Put(HB_TAG('u', 'n', 'i', 'c'), 1);
break;
default:
MOZ_ASSERT_UNREACHABLE("Unexpected variantCaps");
break;
}
// font-variant-position - handled here due to the need for fallback
switch (aStyle->variantSubSuper) {
case NS_FONT_VARIANT_POSITION_NORMAL:
break;
case NS_FONT_VARIANT_POSITION_SUPER:
mergedFeatures.Put(HB_TAG('s', 'u', 'p', 's'), 1);
break;
case NS_FONT_VARIANT_POSITION_SUB:
mergedFeatures.Put(HB_TAG('s', 'u', 'b', 's'), 1);
break;
default:
MOZ_ASSERT_UNREACHABLE("Unexpected variantSubSuper");
break;
}
// add font-specific feature values from style rules
if (aStyle->featureValueLookup && numAlts > 0) {
AutoTArray<gfxFontFeature, 4> featureList;
// insert list of alternate feature settings
LookupAlternateValues(aStyle->featureValueLookup, aFamilyName,
aStyle->alternateValues, featureList);
count = featureList.Length();
for (i = 0; i < count; i++) {
const gfxFontFeature& feature = featureList.ElementAt(i);
mergedFeatures.Put(feature.mTag, feature.mValue);
}
}
// add feature values from style rules
count = styleRuleFeatures.Length();
for (i = 0; i < count; i++) {
const gfxFontFeature& feature = styleRuleFeatures.ElementAt(i);
mergedFeatures.Put(feature.mTag, feature.mValue);
}
if (mergedFeatures.Count() != 0) {
for (auto iter = mergedFeatures.Iter(); !iter.Done(); iter.Next()) {
aHandleFeature(iter.Key(), iter.Data(), aHandleFeatureData);
}
}
}
void gfxShapedText::SetupClusterBoundaries(uint32_t aOffset,
const char16_t* aString,
uint32_t aLength) {
CompressedGlyph* glyphs = GetCharacterGlyphs() + aOffset;
CompressedGlyph extendCluster = CompressedGlyph::MakeComplex(false, true, 0);
ClusterIterator iter(aString, aLength);
// the ClusterIterator won't be able to tell us if the string
// _begins_ with a cluster-extender, so we handle that here
if (aLength) {
uint32_t ch = *aString;
if (aLength > 1 && NS_IS_HIGH_SURROGATE(ch) &&
NS_IS_LOW_SURROGATE(aString[1])) {
ch = SURROGATE_TO_UCS4(ch, aString[1]);
}
if (IsClusterExtender(ch)) {
*glyphs = extendCluster;
}
}
while (!iter.AtEnd()) {
if (*iter == char16_t(' ')) {
glyphs->SetIsSpace();
}
// advance iter to the next cluster-start (or end of text)
iter.Next();
// step past the first char of the cluster
aString++;
glyphs++;
// mark all the rest as cluster-continuations
while (aString < iter) {
*glyphs = extendCluster;
glyphs++;
aString++;
}
}
}
void gfxShapedText::SetupClusterBoundaries(uint32_t aOffset,
const uint8_t* aString,
uint32_t aLength) {
CompressedGlyph* glyphs = GetCharacterGlyphs() + aOffset;
const uint8_t* limit = aString + aLength;
while (aString < limit) {
if (*aString == uint8_t(' ')) {
glyphs->SetIsSpace();
}
aString++;
glyphs++;
}
}
gfxShapedText::DetailedGlyph* gfxShapedText::AllocateDetailedGlyphs(
uint32_t aIndex, uint32_t aCount) {
NS_ASSERTION(aIndex < GetLength(), "Index out of range");
if (!mDetailedGlyphs) {
mDetailedGlyphs = MakeUnique<DetailedGlyphStore>();
}
return mDetailedGlyphs->Allocate(aIndex, aCount);
}
void gfxShapedText::SetGlyphs(uint32_t aIndex, CompressedGlyph aGlyph,
const DetailedGlyph* aGlyphs) {
NS_ASSERTION(!aGlyph.IsSimpleGlyph(), "Simple glyphs not handled here");
NS_ASSERTION(aIndex > 0 || aGlyph.IsLigatureGroupStart(),
"First character can't be a ligature continuation!");
uint32_t glyphCount = aGlyph.GetGlyphCount();
if (glyphCount > 0) {
DetailedGlyph* details = AllocateDetailedGlyphs(aIndex, glyphCount);
memcpy(details, aGlyphs, sizeof(DetailedGlyph) * glyphCount);
}
GetCharacterGlyphs()[aIndex] = aGlyph;
}
#define ZWNJ 0x200C
#define ZWJ 0x200D
static inline bool IsIgnorable(uint32_t aChar) {
return (IsDefaultIgnorable(aChar)) || aChar == ZWNJ || aChar == ZWJ;
}
void gfxShapedText::SetMissingGlyph(uint32_t aIndex, uint32_t aChar,
gfxFont* aFont) {
uint8_t category = GetGeneralCategory(aChar);
if (category >= HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK &&
category <= HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) {
GetCharacterGlyphs()[aIndex].SetComplex(false, true, 0);
}
DetailedGlyph* details = AllocateDetailedGlyphs(aIndex, 1);
details->mGlyphID = aChar;
if (IsIgnorable(aChar)) {
// Setting advance width to zero will prevent drawing the hexbox
details->mAdvance = 0;
} else {
gfxFloat width =
std::max(aFont->GetMetrics(gfxFont::eHorizontal).aveCharWidth,
gfxFloat(gfxFontMissingGlyphs::GetDesiredMinWidth(
aChar, mAppUnitsPerDevUnit)));
details->mAdvance = uint32_t(width * mAppUnitsPerDevUnit);
}
GetCharacterGlyphs()[aIndex].SetMissing(1);
}
bool gfxShapedText::FilterIfIgnorable(uint32_t aIndex, uint32_t aCh) {
if (IsIgnorable(aCh)) {
// There are a few default-ignorables of Letter category (currently,
// just the Hangul filler characters) that we'd better not discard
// if they're followed by additional characters in the same cluster.
// Some fonts use them to carry the width of a whole cluster of
// combining jamos; see bug 1238243.
if (GetGenCategory(aCh) == nsUGenCategory::kLetter &&
aIndex + 1 < GetLength() &&
!GetCharacterGlyphs()[aIndex + 1].IsClusterStart()) {
return false;
}
DetailedGlyph* details = AllocateDetailedGlyphs(aIndex, 1);
details->mGlyphID = aCh;
details->mAdvance = 0;
GetCharacterGlyphs()[aIndex].SetMissing(1);
return true;
}
return false;
}
void gfxShapedText::AdjustAdvancesForSyntheticBold(float aSynBoldOffset,
uint32_t aOffset,
uint32_t aLength) {
uint32_t synAppUnitOffset = aSynBoldOffset * mAppUnitsPerDevUnit;
CompressedGlyph* charGlyphs = GetCharacterGlyphs();
for (uint32_t i = aOffset; i < aOffset + aLength; ++i) {
CompressedGlyph* glyphData = charGlyphs + i;
if (glyphData->IsSimpleGlyph()) {
// simple glyphs ==> just add the advance
int32_t advance = glyphData->GetSimpleAdvance() + synAppUnitOffset;
if (CompressedGlyph::IsSimpleAdvance(advance)) {
glyphData->SetSimpleGlyph(advance, glyphData->GetSimpleGlyph());
} else {
// rare case, tested by making this the default
uint32_t glyphIndex = glyphData->GetSimpleGlyph();
glyphData->SetComplex(true, true, 1);
DetailedGlyph detail = {glyphIndex, advance, gfx::Point()};
SetGlyphs(i, *glyphData, &detail);
}
} else {
// complex glyphs ==> add offset at cluster/ligature boundaries
uint32_t detailedLength = glyphData->GetGlyphCount();
if (detailedLength) {
DetailedGlyph* details = GetDetailedGlyphs(i);
if (!details) {
continue;
}
if (IsRightToLeft()) {
details[0].mAdvance += synAppUnitOffset;
} else {
details[detailedLength - 1].mAdvance += synAppUnitOffset;
}
}
}
}
}
float gfxFont::AngleForSyntheticOblique() const {
// If the style doesn't call for italic/oblique, or if the face already
// provides it, no synthetic style should be added.
if (mStyle.style == FontSlantStyle::Normal() || !mStyle.allowSyntheticStyle ||
!mFontEntry->IsUpright()) {
return 0.0f;
}
// If style calls for italic, and face doesn't support it, use default
// oblique angle as a simulation.
if (mStyle.style.IsItalic()) {
return mFontEntry->SupportsItalic() ? 0.0f : FontSlantStyle::kDefaultAngle;
}
// Default or custom oblique angle
return mStyle.style.ObliqueAngle();
}
float gfxFont::SkewForSyntheticOblique() const {
// Precomputed value of tan(kDefaultAngle), the default italic/oblique slant;
// avoids calling tan() at runtime except for custom oblique values.
static const float kTanDefaultAngle =
tan(FontSlantStyle::kDefaultAngle * (M_PI / 180.0));
float angle = AngleForSyntheticOblique();
if (angle == 0.0f) {
return 0.0f;
} else if (angle == FontSlantStyle::kDefaultAngle) {
return kTanDefaultAngle;
} else {
return tan(angle * (M_PI / 180.0));
}
}
void gfxFont::RunMetrics::CombineWith(const RunMetrics& aOther,
bool aOtherIsOnLeft) {
mAscent = std::max(mAscent, aOther.mAscent);
mDescent = std::max(mDescent, aOther.mDescent);
if (aOtherIsOnLeft) {
mBoundingBox = (mBoundingBox + gfxPoint(aOther.mAdvanceWidth, 0))
.Union(aOther.mBoundingBox);
} else {
mBoundingBox =
mBoundingBox.Union(aOther.mBoundingBox + gfxPoint(mAdvanceWidth, 0));
}
mAdvanceWidth += aOther.mAdvanceWidth;
}
gfxFont::gfxFont(const RefPtr<UnscaledFont>& aUnscaledFont,
gfxFontEntry* aFontEntry, const gfxFontStyle* aFontStyle,
AntialiasOption anAAOption, cairo_scaled_font_t* aScaledFont)
: mScaledFont(aScaledFont),
mFontEntry(aFontEntry),
mUnscaledFont(aUnscaledFont),
mStyle(*aFontStyle),
mAdjustedSize(0.0),
mFUnitsConvFactor(-1.0f), // negative to indicate "not yet initialized"
mAntialiasOption(anAAOption),
mIsValid(true),
mApplySyntheticBold(false),
mKerningEnabled(false),
mMathInitialized(false) {
#ifdef DEBUG_TEXT_RUN_STORAGE_METRICS
++gFontCount;
#endif
// Turn off AA for Ahem for testing purposes when requested.
if (MOZ_UNLIKELY(StaticPrefs::gfx_font_ahem_antialias_none() &&
mFontEntry->FamilyName().EqualsLiteral("Ahem"))) {
mAntialiasOption = kAntialiasNone;
}
mKerningSet = HasFeatureSet(HB_TAG('k', 'e', 'r', 'n'), mKerningEnabled);
}
gfxFont::~gfxFont() {
mFontEntry->NotifyFontDestroyed(this);
if (mGlyphChangeObservers) {
for (auto it = mGlyphChangeObservers->Iter(); !it.Done(); it.Next()) {
it.Get()->GetKey()->ForgetFont();
}
}
}
// Work out whether cairo will snap inter-glyph spacing to pixels.
//
// Layout does not align text to pixel boundaries, so, with font drawing
// backends that snap glyph positions to pixels, it is important that
// inter-glyph spacing within words is always an integer number of pixels.
// This ensures that the drawing backend snaps all of the word's glyphs in the
// same direction and so inter-glyph spacing remains the same.
//
gfxFont::RoundingFlags gfxFont::GetRoundOffsetsToPixels(
DrawTarget* aDrawTarget) {
RoundingFlags result = RoundingFlags(0);
// Could do something fancy here for ScaleFactors of
// AxisAlignedTransforms, but we leave things simple.
// Not much point rounding if a matrix will mess things up anyway.
// Also return false for non-cairo contexts.
if (aDrawTarget->GetTransform().HasNonTranslation()) {
return result;
}
// All raster backends snap glyphs to pixels vertically.
// Print backends set CAIRO_HINT_METRICS_OFF.
result |= RoundingFlags::kRoundY;
// If we can't set up the cairo font, bail out.
if (!SetupCairoFont(aDrawTarget)) {
return result;
}
cairo_t* cr = gfxFont::RefCairo(aDrawTarget);
cairo_scaled_font_t* scaled_font = cairo_get_scaled_font(cr);
// bug 1198921 - this sometimes fails under Windows for whatver reason
NS_ASSERTION(scaled_font,
"null cairo scaled font should never be returned "
"by cairo_get_scaled_font");
if (!scaled_font) {
result |= RoundingFlags::kRoundX; // default to the same as the fallback
// path below
return result;
}
// Sometimes hint metrics gets set for us, most notably for printing.
#ifdef MOZ_TREE_CAIRO
cairo_hint_metrics_t hint_metrics =
cairo_scaled_font_get_hint_metrics(scaled_font);
#else
cairo_font_options_t* font_options = cairo_font_options_create();
cairo_scaled_font_get_font_options(scaled_font, font_options);
cairo_hint_metrics_t hint_metrics =
cairo_font_options_get_hint_metrics(font_options);
cairo_font_options_destroy(font_options);
#endif
switch (hint_metrics) {
case CAIRO_HINT_METRICS_OFF:
result &= ~RoundingFlags::kRoundY;
return result;
case CAIRO_HINT_METRICS_DEFAULT:
// Here we mimic what cairo surface/font backends do. Printing
// surfaces have already been handled by hint_metrics. The
// fallback show_glyphs implementation composites pixel-aligned
// glyph surfaces, so we just pick surface/font combinations that
// override this.
switch (cairo_scaled_font_get_type(scaled_font)) {
#if CAIRO_HAS_DWRITE_FONT // dwrite backend is not in std cairo releases yet
case CAIRO_FONT_TYPE_DWRITE:
// show_glyphs is implemented on the font and so is used for
// all surface types; however, it may pixel-snap depending on
// the dwrite rendering mode
if (!cairo_dwrite_scaled_font_get_force_GDI_classic(scaled_font) &&
gfxWindowsPlatform::GetPlatform()->DWriteMeasuringMode() ==
DWRITE_MEASURING_MODE_NATURAL) {
return result;
}
MOZ_FALLTHROUGH;
#endif
case CAIRO_FONT_TYPE_QUARTZ:
// Quartz surfaces implement show_glyphs for Quartz fonts
if (cairo_surface_get_type(cairo_get_target(cr)) ==
CAIRO_SURFACE_TYPE_QUARTZ) {
return result;
}
break;
default:
break;
}
break;
case CAIRO_HINT_METRICS_ON:
break;
}
result |= RoundingFlags::kRoundX;
return result;
}
gfxFloat gfxFont::GetGlyphHAdvance(DrawTarget* aDrawTarget, uint16_t aGID) {
if (!SetupCairoFont(aDrawTarget)) {
return 0;
}
if (ProvidesGlyphWidths()) {
return GetGlyphWidth(aGID) / 65536.0;
}
if (mFUnitsConvFactor < 0.0f) {
GetMetrics(eHorizontal);
}
NS_ASSERTION(mFUnitsConvFactor >= 0.0f,
"missing font unit conversion factor");
if (!mHarfBuzzShaper) {
mHarfBuzzShaper = MakeUnique<gfxHarfBuzzShaper>(this);
}
gfxHarfBuzzShaper* shaper =
static_cast<gfxHarfBuzzShaper*>(mHarfBuzzShaper.get());
if (!shaper->Initialize()) {
return 0;
}
return shaper->GetGlyphHAdvance(aGID) / 65536.0;
}
static void CollectLookupsByFeature(hb_face_t* aFace, hb_tag_t aTableTag,
uint32_t aFeatureIndex,
hb_set_t* aLookups) {
uint32_t lookups[32];
uint32_t i, len, offset;
offset = 0;
do {
len = ArrayLength(lookups);
hb_ot_layout_feature_get_lookups(aFace, aTableTag, aFeatureIndex, offset,
&len, lookups);
for (i = 0; i < len; i++) {
hb_set_add(aLookups, lookups[i]);
}
offset += len;
} while (len == ArrayLength(lookups));
}
static void CollectLookupsByLanguage(
hb_face_t* aFace, hb_tag_t aTableTag,
const nsTHashtable<nsUint32HashKey>& aSpecificFeatures,
hb_set_t* aOtherLookups, hb_set_t* aSpecificFeatureLookups,
uint32_t aScriptIndex, uint32_t aLangIndex) {
uint32_t reqFeatureIndex;
if (hb_ot_layout_language_get_required_feature_index(
aFace, aTableTag, aScriptIndex, aLangIndex, &reqFeatureIndex)) {
CollectLookupsByFeature(aFace, aTableTag, reqFeatureIndex, aOtherLookups);
}
uint32_t featureIndexes[32];
uint32_t i, len, offset;
offset = 0;
do {
len = ArrayLength(featureIndexes);
hb_ot_layout_language_get_feature_indexes(aFace, aTableTag, aScriptIndex,
aLangIndex, offset, &len,
featureIndexes);
for (i = 0; i < len; i++) {
uint32_t featureIndex = featureIndexes[i];
// get the feature tag
hb_tag_t featureTag;
uint32_t tagLen = 1;
hb_ot_layout_language_get_feature_tags(aFace, aTableTag, aScriptIndex,
aLangIndex, offset + i, &tagLen,
&featureTag);
// collect lookups
hb_set_t* lookups = aSpecificFeatures.GetEntry(featureTag)
? aSpecificFeatureLookups
: aOtherLookups;
CollectLookupsByFeature(aFace, aTableTag, featureIndex, lookups);
}
offset += len;
} while (len == ArrayLength(featureIndexes));
}
static bool HasLookupRuleWithGlyphByScript(
hb_face_t* aFace, hb_tag_t aTableTag, hb_tag_t aScriptTag,
uint32_t aScriptIndex, uint16_t aGlyph,
const nsTHashtable<nsUint32HashKey>& aDefaultFeatures,
bool& aHasDefaultFeatureWithGlyph) {
uint32_t numLangs, lang;
hb_set_t* defaultFeatureLookups = hb_set_create();
hb_set_t* nonDefaultFeatureLookups = hb_set_create();
// default lang
CollectLookupsByLanguage(aFace, aTableTag, aDefaultFeatures,
nonDefaultFeatureLookups, defaultFeatureLookups,
aScriptIndex, HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX);
// iterate over langs
numLangs = hb_ot_layout_script_get_language_tags(
aFace, aTableTag, aScriptIndex, 0, nullptr, nullptr);
for (lang = 0; lang < numLangs; lang++) {
CollectLookupsByLanguage(aFace, aTableTag, aDefaultFeatures,
nonDefaultFeatureLookups, defaultFeatureLookups,
aScriptIndex, lang);
}
// look for the glyph among default feature lookups
aHasDefaultFeatureWithGlyph = false;
hb_set_t* glyphs = hb_set_create();
hb_codepoint_t index = -1;
while (hb_set_next(defaultFeatureLookups, &index)) {
hb_ot_layout_lookup_collect_glyphs(aFace, aTableTag, index, glyphs, glyphs,
glyphs, nullptr);
if (hb_set_has(glyphs, aGlyph)) {
aHasDefaultFeatureWithGlyph = true;
break;
}
}